Then you are wrong.You are framing your challenge as if evolution (advanced complexity) is true. I don't accept that. I believe organisms can maintain themselves in good condition if all their needs are met, but not become more complex.
Sientists subjected a yeast, Saccharomyces cerevisiae to certain conditions in which multicellularity would be an advantage. And indeed, the yeast went from unicellular to multicellular.
http://www.pnas.org/content/109/5/1595.full.pdf+html
This is not "speculation" or "guessing", or "opinion" or any other qualification by which creationists wave away evidence they don't like.The multicellular clusters are uniclonal, minimizing within-cluster genetic conflicts of interest. Simple among-cell division of labor rapidly evolved. Early multicellular strains were composed of physiologically similar cells, but these subsequently evolved higher rates of programmed cell death (apoptosis), an adaptation that increases propagule production. These results show that key aspects of multicellular complexity, a subject of central importance to biology, can readily evolve from unicellular eukaryotes
This has been observed, during experiments in a lab, and it shows that unicellular can evolve into multicellular organism, including cell division and controlled cell death.
Here another example, with another organism:
http://pleiotropy.fieldofscience.com/2008/11/watching-multicellularity-evolve-before.html
Very soon (about 10 days) after the introduction of the flagellate predator, Chlorella colonies started to form. These initially consisted of aggregates of tens to hundreds on Chlorella cells, adhering to each other. Their sheer size prevented the predator from eating them, and thus the multicellular Chlorella was fitter than the unicellular ones, and as a result the unicellular Chlorella all but disappeared. Multicellularity had evolved right before the lucky scientists' eyes.
When Boraas et al. removed the predator from the environment, Chlorella colonies continued to make multicellular offspring.
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